self-employed client has Defined Benefit contribution.  But, in Lacerte, this DB contribution does not reduce QBI from net profit in Schedule C.  Is this correct?

For example, he has $100,000 net incomes and contribute $60,000 to his DB in 2018.  Lacerte show QBI for $96,900 (just reduce 1/2 of self-employed taxes), and he will have 20% QBI deduction on this $96,900.

I thought retirement plan contribution should be back out of QBI.